Due to asylum and its minimal roleplay, if RP standards were increased, it would have to be increased for all of Asylum, not just the APD. This would drive off many players as quite alot are here for the "run and gun" feel of asylum. Now as we know this isn't happening any time soon, we can think of ways to increase cop RP. I have always believed that rewarding for good RP is much more effective than punishing for the bad.
As legit said, the point system is a neat idea, it would encourage more roleplay throughout the APD.
However, it still won't fix the cops with bad roleplay inside of the APD.
This will never change unless the Application requirements to join the APD are heavily increased.